It is possible that HTTP is using the keyring thus you cannot delete.
You can change it here:
Step 1 In the Navigation pane, click the Admin tab.
Step 2 On the Admin tab, expand All > Communication Management > Communication Services.
Step 3 Select the Communication Services tab.
Step 4 In the HTTPS area, click the enabled radio button.
The HTTPS area expands to display the available configuration options.
Step 5 Under Key Ring drop-down list, select a different key ring
Step 6 Delete the keyring from the key ring management https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Admin-Management/3-1/b_Cisco_UCS_Admin_Mgmt_Guide_3_1/b_Cisco_UCS_Admin_Mgmt_Guide_3_1_chapter_0110.html
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